Content .. 705 706 707 708 ..

Nissan Maxima. Manual - part 707

HAC-4

Diagnosis Procedure .............................................

164

POWER SUPPLY AND GROUND CIRCUIT ...

165

A/C AUTO AMP. ......................................................

165

A/C AUTO AMP. : Description ...............................

165

A/C AUTO AMP. : Component Function Check ....

165

A/C AUTO AMP. : Diagnosis Procedure ...............

165

A/C SWITCH ASSEMBLY .......................................

166

A/C SWITCH ASSEMBLY : Component Function
Check ....................................................................

166

A/C SWITCH ASSEMBLY : Diagnosis Procedure ..

166

A/C DISPLAY UNIT ..................................................

167

A/C DISPLAY UNIT : Diagnosis Procedure ...........

167

ECU DIAGNOSIS INFORMATION .............

169

A/C AUTO AMP. ..............................................

169

Reference Value ....................................................

169

DTC Inspection Priority Chart .............................

170

DTC Index .............................................................

171

WIRING DIAGRAM ....................................

173

AIR CONDITIONER CONTROL ......................

173

Wiring Diagram - With Monochrome Display .........

173

SYMPTOM DIAGNOSIS ............................

183

INSUFFICIENT COOLING ...............................

183

Component Function Check ..................................

183

Diagnostic Work Flow ............................................

185

Performance Chart ................................................

187

INSUFFICIENT HEATING ...............................

189

Component Function Check ..................................

189

NOISE ..............................................................

192

Component Function Check ..................................

192

MEMORY FUNCTION DOES NOT OPERATE .

194

Component Function Check ..................................

194

PRECAUTION ............................................

195

PRECAUTIONS ...............................................

195

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...............................................................

195

Precaution for Work ..............................................

195

Working with HFC-134a (R-134a) .........................

195

Precautions For Refrigerant System Service ........

196

Precaution for Service Equipment ........................

199

PREPARATION .........................................

201

PREPARATION ................................................

201

Special Service Tool .............................................

201

Commercial Service Tool ......................................

201

Sealant and/or Lubricant .......................................

201

REMOVAL AND INSTALLATION .............

203

CONTROL UNIT ...............................................

203

Removal and Installation .......................................

203

AMBIENT SENSOR ..........................................

204

Removal and Installation .......................................

204

IN-VEHICLE SENSOR ......................................

205

Removal and Installation .......................................

205

SUNLOAD SENSOR ........................................

206

Removal and Installation .......................................

206

INTAKE SENSOR .............................................

207

Removal and Installation .......................................

207

REFRIGERANT PRESSURE SENSOR ...........

208

Removal and Installation .......................................

208

DOOR MOTOR .................................................

209

Exploded View ......................................................

209

INTAKE DOOR MOTOR .........................................

210

INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................

210

MODE DOOR MOTOR ............................................

210

MODE DOOR MOTOR : Removal and Installation .

210

AIR MIX DOOR MOTOR .........................................

210

AIR MIX DOOR MOTOR : Removal and Installa-
tion - Air Mix Door Motor (Driver Side) ..................

210

AIR MIX DOOR MOTOR : Removal and Installa-
tion - Air Mix Door Motor (Passenger Side) ..........

210

INSPECTION AND ADJUSTMENT

HAC-5

< BASIC INSPECTION >

[WITH COLOR DISPLAY]

HAC

BASIC INSPECTION

INSPECTION AND ADJUSTMENT

Operational Check

INFOID:0000000010050942

DESCRIPTION

The purpose of the operational check is to check that the individual system operates normally.

INSPECTION PROCEDURE

CHECK MEMORY FUNCTION

1. Start the engine.

2. Operate the temperature control dial (driver side) and raise the temperature setting to 32

°C (90°F).

3. Press the OFF switch.

4. Turn the ignition switch OFF.

5. Turn the ignition switch ON.

6. Press the AUTO switch.

7. Check that the temperature setting, before turning the ignition switch OFF, is stored.
Is the inspection result normal?

YES

>> GO TO 2.

>> Check power and ground circuits for A/C auto amp. Refer to

HAC-60, "A/C AUTO AMP. : Diagno-

sis Procedure"

CHECK BLOWER MOTOR SPEED

1. Operate the fan control dial. Check that the fan speed changes.

2. Check the operation for all fan speeds.
Is the inspection result normal?

YES

>> GO TO 3.

>> Check blower motor system. Refer to

HAC-53, "Diagnosis Procedure"

CHECK DISCHARGE AIR (MODE SWITCH AND DEF SWITCH)

1. Press the MODE switch and the DEF switch.

2. Check that the air outlets change according to each indicated air outlet by placing a hand in front of the

outlets. Refer to

HAC-11, "System Description"

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at FRE
(

) when the D/F (

) or DEF (

) is selected.

Is the inspection result normal?

YES

>> GO TO 4.

>> Check mode door system. Refer to

HAC-49, "Diagnosis Procedure"

CHECK INTAKE AIR

1. Press the REC (

) switch. Indicator is turned ON.

2. Press the FRE (

) switch. Indicator is turned ON.

3. Listen for the intake door position change. (Slight change of blower sound can be heard.)

NOTE:
Confirm that the compressor clutch is engaged (sound or visual inspection) and the FRE (

) switch is

pressed when the D/F (

) or DEF (

) is selected.

Is the inspection result normal?

YES

>> GO TO 5.

>> Check intake door system. Refer to

HAC-52, "Diagnosis Procedure"

CHECK A/C SWITCH

1. Press the A/C switch.

2. The A/C switch indicator is turned ON.

Conditions

: Engine running at normal operating temperature

HAC-6

< BASIC INSPECTION >

[WITH COLOR DISPLAY]

INSPECTION AND ADJUSTMENT

Confirm that the compressor clutch engages (sound or visual inspection).

Is the inspection result normal?

YES

>> GO TO 6.

>> Check magnet clutch system. Refer to

HAC-57, "Diagnosis Procedure"

CHECK TEMPERATURE DECREASE

1. Operate the compressor.

2. Operate the temperature control switch (driver side) and lower the temperature setting to 18

°C (60°F).

3. Check that the cool air blows from the outlets.
Is the inspection result normal?

YES

>> GO TO 7.

>> Check for insufficient cooling. Refer to

HAC-80, "Component Function Check"

CHECK TEMPERATURE INCREASE

1. Operate the temperature control dial (driver side) and raise the temperature setting to 32

°C (90°F) after

warming up the engine.

2. Check that the warm air blows from the outlets.
Is the inspection result normal?

YES

>> GO TO 8.

>> Check for insufficient heating. Refer to

HAC-86, "Component Function Check"

CHECK DUAL MODE FUNCTION

1. Press the DUAL mode switch, and then check that “DUAL” is shown on the display.

2. Operate the temperature control dial (driver side). Check that the discharge air temperature (driver side)

changes.

3. Operate the temperature control dial (passenger side). Check that the discharge air temperature (passen-

ger side) changes.

4. Press the DUAL mode switch, and then check that the temperature setting (driver/passenger) is unified to

the driver side temperature setting.

Is the inspection result normal?

YES

>> GO TO 9.

>> Refer to

HA-21, "WITH COLOR DISPLAY : Symptom Matrix Chart"

and perform the appropriate

diagnosis.

CHECK AUTO MODE

1. Press the AUTO switch, and then check that “AUTO” is shown on the display.

2. Operate the temperature control dial (driver side). Check that the fan speed, outlet air or intake air

changes. (The discharge air temperature or fan speed varies depending on the ambient temperature, in-

vehicle temperature, and temperature setting.)

Is the inspection result normal?

YES

>> Inspection End

>> Refer to

HA-21, "WITH COLOR DISPLAY : Symptom Matrix Chart"

and perform the appropriate

diagnosis.

Temperature Setting Trimmer

INFOID:0000000010050943

Description

If the temperature felt by the customer is different than the airflow temperature controlled by the temperature

setting, the auto amplifier control temperature can be adjusted to compensate for the temperature setting.

How to set

Using CONSULT, perform “TEMP SET CORRECT” in “WORK SUPPORT” of HVAC.

INSPECTION AND ADJUSTMENT

HAC-7

< BASIC INSPECTION >

[WITH COLOR DISPLAY]

HAC

NOTE:
• When the temperature setting is set to 25.0

°C (77°F) and −3.0°C (−6°F), the temperature controlled by auto amp is 25.0°C (77°F) −

3.0

°C (6°F) = 22.0°C (71°F) and the temperature becomes lower than the temperature setting.

• When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V or less, the setting of the

difference between the temperature setting and control temperature may be cancelled.

Foot Position Setting Trimmer

INFOID:0000000010050944

Description

In the FOOT mode, the air blowing to the DEF can be turned ON/OFF.

How to set

Using CONSULT, perform “BLOW SET” in “WORK SUPPORT” of HVAC.

NOTE:

When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10V

or less, the setting of the discharge air mix ratio in FOOT mode may be cancelled.

Inlet Port Memory Function (FRE)

INFOID:0000000010050945

Description

• If the ignition switch is turned to the OFF position while the FRE (

) switch is set to ON (fresh air intake),

“Perform the memory” or “Do not perform the memory” of the FRE (

) switch ON (fresh air intake) con-

dition can be selected.

• If “Perform the memory” was set, the FRE (

) switch will be ON (fresh air intake) when turning the igni-

tion switch to the ON position again.

• If “Do not perform the memory” was set, the air inlets will be controlled automatically when turning the igni-

tion switch to the ON position again.

How to set

Using CONSULT, perform “FRE MEMORY SET” in “WORK SUPPORT” of HVAC.

Work support items

Display (

°F)

Display (

°C)

TEMP SET CORRECT

3.0

2.5

2.0

1.5

1.0

0.5

0 (initial status)

−1

−0.5

−2

−1.0

−3

−1.5

−4

−2.0

−5

−2.5

−6

−3.0

Work support items

Display

DEF door position

Auto control

Manual control

BLOW SET

Mode 1

OPEN

Mode 2 (initial status)

OPEN

Mode 3

OPEN

Mode 4

Content .. 705 706 707 708 ..